Trulia did something very similar to Bills.com with their landing page. It starts with a simple form asking for "an address" (which sounds less creepy than "your address," although that's what they mean). Below this simple form field is a bright orange button that contrasts well with the hero image behind the form, and emphasizes that the estimate will be personalized to your home.
The first stage in setting up sales funnel reporting is to understand your sales process fully (perhaps using a technique like flowcharting). While sales processes are often quite similar from company-to-company, there can be points of difference depending, for example, on the size of the order and the consequences to the client of making the wrong purchase decision.
Open-ended experimentation. This approach is similar to closed-ended experimentation except that more variations will be added for testing and experimentation will not stop when a winner is found. This method is used by large corporation to dynamically improve their conversion rates and improve user experience. Landing page can also be adjusted dynamically as the experiment results change to further enhance user experience.